Effects of rate and frequency of applied P on crop yields, P uptake, and fertilizer P use-efficiency and its recovery in a groundnut–mustard rotation
A field experiment was conducted for 5 years (1992/93–1996/97) on Tolewal sandy loam soil (Typic Ustochrepts) in the subtropical region of northwest India (Ludhiana), to evaluate the effect of four rates of fertilizer P (0, 20, 30 and 40 kg P2O5/ha) applied at three frequencies representing direct,...
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Veröffentlicht in: | The Journal of agricultural science 1999-03, Vol.132 (2), p.181-188 |
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Sprache: | eng |
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Zusammenfassung: | A field experiment was conducted for 5 years (1992/93–1996/97)
on Tolewal sandy loam soil (Typic
Ustochrepts) in the subtropical region of northwest India (Ludhiana), to
evaluate the effect of four
rates of fertilizer P (0, 20, 30 and 40 kg P2O5/ha)
applied at three frequencies representing direct,
residual and cumulative P treatments on crop yields, P uptake, fertilizer
P-use efficiency and fertilizer
P recovery by groundnut (Arachis hypogaea) and mustard (Brassica
napus) grown in a rotation. Groundnut responded to an application of P up to 20 kg P2O5/ha
when the preceding mustard crop
did not receive fertilizer P. However, when the mustard received 40 kg
P2O5/ha, the succeeding
groundnut crop did not respond to additional P applied to it, but obtained
the required P from that
which was in the soil including the residue from the previous application.
The mustard crop
responded significantly (46%) to P up to 40 kg P2O5/ha
rate but there was a much less response
(13–27%) to residual P that was applied to the preceding groundnut.
The differences between these
two crops are due to differences in climate between the mustard and groundnut
growing seasons and
corresponding differences in soil conditions, and perhaps also to differences
in the P-solubilizing
abilities of the two crops. The results suggest that in groundnut–mustard
rotations grown under these
climatic conditions, a direct application of 40 kg P2O5/ha
to mustard would suffice to meet the P
needs of both crops. This would be the most efficient way of using fertilizer
P, increasing P recovery
and improving total biomass partitioning to mustard seed or groundnut pod
yield. |
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ISSN: | 0021-8596 1469-5146 |
DOI: | 10.1017/S0021859698006297 |